I use witch https://manytricks.com/witch/

It's a must have app for me. I actually cannot use other people's laptops if they don't have it.

Try cmd + ` (backtick)

System Preferences > Keyboard > Shortcuts > Keyboard > Move focus to active or next window

You can with HyperSwitch: https://bahoom.com/hyperswitch

Command + Tilde.

⌘ + ~